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Probability is one of the most important GMAT Quant topics because it often combines logic, counting, set theory, and permutations & combinations. Many students try to solve probability questions by listing every possible case, but GMAT probability...
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mcelroytutoring
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Expert reply
Updated on: 14 Nov 2016, 12:03
Originally posted by mcelroytutoring on 17 Aug 2016, 11:14.
Last edited by mcelroytutoring on 14 Nov 2016, 12:03, edited 3 times in total.
Last edited by mcelroytutoring on 14 Nov 2016, 12:03, edited 3 times in total.
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Please see attached.
This is not meant to be an exhaustive list, just a helpful one. If I'm missing any formulas that you think are essential, then let me know and I'll add them below:
ADDITIONAL FORMULAS
12) % change/increase/decrease = (difference)/(original) x 100
13) # of subsets of a set with n members: \(2^n\)
-Brian
This is not meant to be an exhaustive list, just a helpful one. If I'm missing any formulas that you think are essential, then let me know and I'll add them below:
ADDITIONAL FORMULAS
12) % change/increase/decrease = (difference)/(original) x 100
13) # of subsets of a set with n members: \(2^n\)
-Brian
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Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
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RaghavSingla
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17 Aug 2016, 13:52
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Number of ways of doing 3 things? Can you elaborate on that.
mcelroytutoring
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GMAT 1: 770 Q47 V48
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GMAT 3: 750 Q50 V42
GMAT 4: 730 Q48 V42 (Online)
GRE 1: Q168 V169
GRE 2: Q170 V170
Expert reply
Updated on: 20 Aug 2018, 11:20
Originally posted by mcelroytutoring on 17 Aug 2016, 17:13.
Last edited by mcelroytutoring on 20 Aug 2018, 11:20, edited 1 time in total.
Last edited by mcelroytutoring on 20 Aug 2018, 11:20, edited 1 time in total.
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RaghavSingla
Sure! This is otherwise known as the "fundamental counting principle."
Let's say 4 = # of breakfast options, 5 = # of lunch options, and 6 = # of dinner options.
My total number of dining possibilities that day is 4 x 5 x 6 = 120.
